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AWS Certified Solutions Architect study material · question 200 of 500

Two clients write the same object key to a versioning-enabled bucket at the same moment. What does S3 do?

  1. It stores both objects as separate versions
  2. It keeps only the later write and discards the earlier one
  3. It rejects both writes with a conflict error
  4. It merges the two objects into one version
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Answer: A. It stores both objects as separate versions

With versioning enabled S3 keeps every write rather than letting one simultaneous request overwrite another.

Source: Retaining multiple versions of objects with S3 Versioning (Amazon Web Services) — Retaining multiple versions of objects with S3 Versioning

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